Stone-saw.



J. PECKOVER. STONE SAW.

APPLIQATIQN FILED JUNE 1, 1912 1,065,833, Patented June 24, 1913.

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STONE SAW. APPLICATION FILED JUNE I 1912.

1,065,833. Patented June24,1913.

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UNITED STATES PATENT @FFIQE.

JAMES PECKOVER, OF PHILADELPHIA, I ENNSYLVANIA, ASSIGNOR OF ONE-THIRD TOJOHN SCANLIN AND ONE-THIRD T0 HUMBERT B. POWELL, BOTH OF PHILADEL-PI-IIA, PENNSYLVANIA.

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To all whom it may concern:

Be it known that I, JAMES PnoKovER, a citizen of the United States,residing in Philadelphia, Pennsylvania, have invented certainImprovements in Stone- Saws, of which the following is a specification.

The object of my invention is to construct a stone saw having a metallicbody with detachable teeth made of a composition of abrading material.

A further object of the invention is to utilize a plastic material forsecuring the teeth to the blade and for securing one tooth to another.This plastic material is preferably of an abrasive nature so that whenthe teeth are inserted the saw will have a continuous abrading surface.

By my invention any one of the teeth can be readily removed andreplaced, if broken, and yet when in place will be rigidly secured tothe blade so as to properly cut marble, granite and other stone oranalogous substances.

My invention dispenses with the use of loose abrading material.

In the accompanying drawings :Figure 1, is a side view of my improvedstone saw; Fig. 2, is an enlarged view, showing a tooth in position tobe inserted in a saw blade; Fig. 3, is a view similar to Fig. 2, showingthe teeth inserted in the blade; Fig. 4, is a sectional view on the linet l, Fig. 3; Fig. 5, is a sectional view on the line 5-5, Fig. 3; Fig.6, is a sectional view on the line 66, Fig. 8; Fig. 7, is a perspectiveview of one of the teeth; Fig. 8, is a side View illustrating a modifiedform of tooth; Fig.

9, is a sectional view on the line 9-9, Fig.

8; Fig. 10, is a still further modification of a tooth; Fig. 11, is aperspective view illustrating a metallic reinforce for a tooth; and Fig.12, is a view of a modification of a saw.

Referring to the drawings, A is a me tallic blade having a series ofnotches a spaced a given distance apart and a are V-shaped ribsextending across the base of each notch.

a are V-shaped ribs on one edge of the blade extending from one notch tothe other.

B are the teeth of the saw made of a composition of carborundum, emery,or other abrading material, and preferably of a greater thickness thanthe blade of the saw. Each tooth has an under-cut projection 19, whichextends into the notch a. In the up- Specification of Letters Patent.

Application filed June 1, 1912.

Patented June 24, 1913. Serial No. 700,958.

per edge of this projection is a Vshaped groove 6 into which extends theV-shaped rib a on the blade.

6 are V-shaped grooves at each side of the projection into which extendthe ribs a The projection Z) is of such a size that the tooth can beplaced laterally in the notch, as 1n Fig. 2, and then forced against theblade A, as in Fig. 3, so that the ribs a and a will extend into thegrooves of the tooth. This leaves spaces 0c between the walls of thenotches and the projections Z). Each space is filled with a compositionhaving an abrasive material as its base. When this composition sets, itforms a portion of the tooth. The end (Z of each tooth is in the form ofa V-shaped rib and the teeth are .preferably spaced apart, as indicatedat f,

Figs. 2 and 6. The same composition is placed in the space 0 as isplaced in the space f and when this composition hardens, it is of such anature as to satisfactorily perform the function for which it isintended. hen a series of teeth are in place and properly cemented, thenthere is a continuous abrasive edge from one end of the saw to theother. Each tooth is rigidly held in position and cannot come out ofalinement. If a tooth should break, then the fragments can be quicklyremoved and a new tooth inserted Without disturbing the other teeth.

I preferably make the teeth of a solid composition and, in someinstances, the teeth may be provided with a reinforcing metal plate, asillustrated in Fig. 11, having perforations through which the abradingmaterial can extend; the abrading ma terial being placed on both sidesof the plate and the sections being tied together by the materialextending through the perforations.

In Fig. 8, I have illustrated a modification of the form of the ends ofthe teeth. The teeth, in this instance, are beveled so as to form aV-shaped opening f into which the abrading material is placed. W' henthe abrading material is set, there is a continuous abrasive surface, asin the construction described above.

In Fig. 10, I have shown another form of blade in which thereare'segmental recesses f in the end of each blade in addition to thebeveled ribs so as to increase the effectiveness of the joint.

I preferably make the teeth of a composition consisting of carborundum,or emery, plaster of Paris, and shellac, dissolved in naphtha and mixedto a stiff paste, after which it is placed in paper lined molds;remaining in the molds until it is thoroughly dried and hardened bybeing subjected to a moderate degree of heat.

In attaching the teeth to the blade, I lay the blade on a fiat surfacewith one edge projecting. I then place the tooth in its recess and forceit against the blade so that the ribs a and a will enter the recesses Z)and 72 of the teeth; first placing a small quantity of the softcomposition in the recesses so that when the edge is forced against theblade a perfect joint will be formed. The spaces c0 are then filled withthe soft composition, as well as the spaces f-f between the severalteeth. This composition is packed firmly in place and the teeth are heldagainst the saw blade until the composition is thoroughly hardened,after which the blade, with the teeth firmly attached thereto, can beremoved and will be ready for use.

In some instances, instead of the blade having projecting ribs a and aand the teeth having recesses to receive the ribs, the teeth may beribbed and the blade recessed, as in Fig. 12, forming, in fact,elongated notches with the abutting edges of the teetl in the notches.

By providing V-shaped ribs at each end of the teeth, lateral movement ofthe composition filling is prevented and the stability of the tooth isincreased. By having the ribs in the recess of the blade and on the edgeof the blade, movement of the tooth is prevented; each tooth being heldin the proper alinement.

I claim:

1. In a stone saw, the combination of a blade, a plurality of teethformed of abrasive material carried by said blade, said teeth havingtheir portions beyond the blade spaced apart a slight distance, meansfor se curing said teeth to the blade, and an abrasive filling for thespaces between the teeth whereby a continuous cutting edge formed.

2. The combination, in a stone cutting saw, of a blade having dovetailrecesses, a plurality of teeth formed of abrasive material, each of saidteeth having a dovetail projection for disposal within a recess in saidblade and being spaced apart a slight distance beyond the blade, saidprojections being less in width than the recesses, bodies ofself-hardening plastic material filling the teeth being made of anabrasive composition and the projections of the same being less in widththan the notches of the blade and the teeth being spaced apart beyondthe blade, and self-hardening abrasive material filling the spacesbetween the teeth and between the teeth and blade and rigidly holdingthe teeth in place.

4. In a stone saw, the combination of a metal blade, a cutting edgeformed of inde pendent and separately set teeth, said teeth being spacedapart beyond the blade, and abrasive material filling the spaces betweenteeth whereby a continuous cutting edge is formed.

5. The combination, in a stone saw, of a blade having a series ofnotches therein, a series of teeth made of an abrasive material, eachhaving an undercut projection adapted to one of said notches, V-shapedprojections on the blade adapted to engage V-shaped recesses in eachtooth, the ends of said teeth beyond the blade being spaced apart andhaving V-shaped projections, and abrasive material filling the spacesbetween the teeth and locked in place by the projections thereof wherebya continuous cutting edge is formed.

6. The combination, in a stone saw, of a blade having a series ofnotches therein, a serles of teeth made of an abrasive material eachhaving an undercut projection adapted to one of said notches, abrasivematerial locking said teeth to the blade, V-sha-ped projections 011 theblade adapted to engage V-shaped grooves in each tooth and the ends ofsaid teeth beyond the blade being spaced apart and having V-shapedprojections,and abrasive material filling the spaces between thoseportions of the teeth beyond the blade and locked in place by theprojections thereof whereby a continuous cutting edge is formed.

In testimony whereof, I have signed my name to this specification, inthe presence out two subscribing witnesses.

JAMES PEoKovER. lVitnesses lVM. E. SHUPE, WVM. A. BARR.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

